242 
and later a fuller account will be published. At the present writing it 
is impossible to determine with absolute exactness, whether or not, the 
second form belongs to the new genus Monochoerus*. A further study 
of material will probably settle the question definitely. 
I. 
Fam. Convolutidae. 
3. Gen. Amphiscolops Graf. 
Amphiscolops fuligineus n. sp. 
The body of the mature individual is larger than the Neapolitan 
form Amphiscolops cinereus to which it is closely related, and with which 
it was found. The length varies from 2,0 to 3,0mm., the breath from 
0,8 to 1,2mm. When swimming the body assumes a cylindrical shape, 
rounded at each end. At rest it is almost quadrangular, rounded an- 
Fig. 1a. teriorly, and square at the posterior end 
except in the middle where a small knob- 
like projection is seen (fig. 1). On the 
dorsal surface the body is convex, on the 
ventral side it is flat. The edges do not 
turn under when the animal swims. 
The deep brown color of the dorsal 
surface is so characteristic, that I have 
given this worm the specific name fuli- 
gineus from the table of colors compiled 
Fig. 1. Diagram showing form by Saccardo4 The anterior end isa 
a ‘et brilliant white, and the remaining 4/, 
of the dorsal surface shades form dark 
brown anteriorly to light brown at the posterior end. Some individuals 
are much lighter in color than others. The ventral surface is marked 
with, a more or less, definite pattern of brown and white. The brown 
color is due to masses of pigment cells, the white is caused by the pre- 
sence of concrement. 
The entire surface of the animal is ciliated. The integument is 
richly supplied with slime glands, but no true rhabdites have been ob- 
served. The frontal gland is highly developed, filling the entire ante- 
rior end of the body. Two small eyes and the statocyst lie in the white 
area near the anterior end. The mouth opening lies much further back 
than that of A. cnereus. 
3 Lohner und Micoletzky, Convoluta pelagica n. sp. und Monochoerus 
illardatus n. g. n. sp., zwei neue Plankton-Acoela der Adria. Zool. Anz. Bd. XXXVII. 
OAL: 
4 Saccardo, P. A., Chromotaxia seu nomenclator Colorum Patavii. 1894. 
